<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>选择器</title>
    <script src="js/jquery-1.11.3.js"></script>
</head>
<body>
        <div>
            <ul>
                <li>今天</li>
            </ul>
        </div>
            <div>明天</div>
            <h2>后天</h2>
            <p>前天</p>
            <script>
                $('div').css('color','blue');    //标签选择器
            </script>

</body>
</html>